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SubjectRe: [PATCH] PCI: hv: Use nested hypercall for retargeting interrupts
On Tue, Apr 04, 2023 at 11:35:46AM +0000, Jinank Jain wrote:
> In case of nested MSHV, retargeting interrupt hypercall should be sent
> to L0 hypervisor instead of L1 hypervisor.
>
> Signed-off-by: Jinank Jain <jinankjain@linux.microsoft.com>

While I think this is a sensible change -- how did you discover this?
Can you provide a bit more information?

> ---
> drivers/pci/controller/pci-hyperv.c | 10 ++++++++--
> 1 file changed, 8 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/pci/controller/pci-hyperv.c b/drivers/pci/controller/pci-hyperv.c
> index f33370b75628..2123f632ecf7 100644
> --- a/drivers/pci/controller/pci-hyperv.c
> +++ b/drivers/pci/controller/pci-hyperv.c
> @@ -704,8 +704,14 @@ static void hv_arch_irq_unmask(struct irq_data *data)
> }
> }
>
> - res = hv_do_hypercall(HVCALL_RETARGET_INTERRUPT | (var_size << 17),
> - params, NULL);
> + if (hv_nested)
> + res = hv_do_nested_hypercall(HVCALL_RETARGET_INTERRUPT |
> + (var_size << 17),
> + params, NULL);
> + else
> + res = hv_do_hypercall(HVCALL_RETARGET_INTERRUPT |
> + (var_size << 17),
> + params, NULL);
>
> exit_unlock:
> spin_unlock_irqrestore(&hbus->retarget_msi_interrupt_lock, flags);
> --
> 2.34.1
>

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